<template>
  <div class="app-container" ref="exam">
    <el-row :gutter="24">
      <el-col :span="24">
        <exam-video v-if="examConfig.openCamera" v-model="examId" style="z-index: 2" />
      </el-col>
      <el-col :span="24">
        <web-change v-if="examConfig.openWebChange" v-model="examConfig.openWebChange" @timeout="outPage($event)" />
      </el-col>
      <el-col :span="24">
        <el-card style="margin-bottom: 10px">

          距离考试结束还有：
          <exam-timer v-model="paperData.timeRemaining" @timeout="outOfExam()" />

          <el-button :loading="loading" style="float: right; margin-top: -10px" type="primary" icon="el-icon-plus"
            @click="handHandExam()">
            {{ handleText }}
          </el-button>

        </el-card>
      </el-col>

      <el-col :span="5" :xs="24" style="margin-bottom: 10px">

        <el-card class="content-h">

          <p class="card-title">答题卡</p>
          <el-row :gutter="24" class="card-line" style="padding-left: 10px">
            <el-tag type="info">未作答</el-tag>
            <el-tag type="success">已作答</el-tag>
          </el-row>

          <div v-if="paperData.radioList !== undefined && paperData.radioList.length > 0">
            <p class="card-title">单选题</p>
            <el-row :gutter="24" class="card-line">
              <el-tag v-for="item in paperData.radioList" :type="cardItemClass(item.answered, item.quId)"
                @click="handSave(item)"> {{ item.sort + 1 }}</el-tag>
            </el-row>
          </div>

          <div v-if="paperData.multiList !== undefined && paperData.multiList.length > 0">
            <p class="card-title">多选题</p>
            <el-row :gutter="24" class="card-line">
              <el-tag v-for="item in paperData.multiList" :type="cardItemClass(item.answered, item.quId)"
                @click="handSave(item)">{{ item.sort + 1 }}</el-tag>
            </el-row>
          </div>

          <div v-if="paperData.judgeList !== undefined && paperData.judgeList.length > 0">
            <p class="card-title">判断题</p>
            <el-row :gutter="24" class="card-line">
              <el-tag v-for="item in paperData.judgeList" :type="cardItemClass(item.answered, item.quId)"
                @click="handSave(item)">{{ item.sort + 1 }}</el-tag>
            </el-row>
          </div>

          <div v-if="paperData.saqList !== undefined && paperData.saqList.length > 0">
            <p class="card-title">主观题</p>
            <el-row :gutter="24" class="card-line">
              <el-tag v-for="item in paperData.saqList" :type="cardItemClass(item.answered, item.quId)"
                @click="handSave(item)">{{ item.sort + 1 }}</el-tag>
            </el-row>
          </div>

        </el-card>

      </el-col>

      <el-col :span="19" :xs="24">

        <el-card class="qu-content content-h">
          <p oncopy="return false" v-if="quData.content">{{ quData.sort + 1 }}.{{ quData.content }}</p>
          <p v-if="quData.image != null && quData.image != ''">
            <el-image :src="quData.image" style="max-width:100%;" />
          </p>
          <div v-if="quData.quType === 1 || quData.quType === 3">
            <el-radio-group v-model="radioValue">
              <el-radio v-for="item in quData.answerList" :label="item.id">{{ item.abc }}.{{ item.content }}
                <div v-if="item.image != null && item.image != ''" style="clear: both">
                  <el-image :src="item.image" style="max-width:100%;" />
                </div>
              </el-radio>
            </el-radio-group>
          </div>

          <div v-if="quData.quType === 2">

            <el-checkbox-group v-model="multiValue">
              <el-checkbox v-for="item in quData.answerList" :key="item.id" :label="item.id">{{ item.abc }}.{{
                item.content }}
                <div v-if="item.image != null && item.image != ''" style="clear: both">
                  <el-image :src="item.image" style="max-width:100%;" />
                </div>
              </el-checkbox>
            </el-checkbox-group>

          </div>
          <!-- 编程题 -->
          <div v-if="quData.quType === 4" @keydown.tab="forbidTab($event)" @keyup.tab="replaceSpacing"
            @keyup.enter="nextLine">

            <el-input id="text" onpaste="enableCopy" v-model="text" class="program_textarea" :precision="1" :max="999999"
              type="textarea" ref="text" :autosize="{ minRows: 20, maxRows: 30 }" />
          </div>
          <!-- 填空题 -->
          <div v-if="quData.quType === 5">

            <el-input v-model="text" class="program">

            </el-input>
          </div>


          <div style="margin-top: 20px">
            <el-button v-if="showPrevious" type="primary" icon="el-icon-back" @click="handPrevious()">
              上一题
            </el-button>

            <el-button v-if="showNext" type="warning" icon="el-icon-right" @click="handNext()">
              下一题
            </el-button>

          </div>

        </el-card>

      </el-col>

    </el-row>

  </div>
</template>

<script>
import { paperDetail, quDetail, handExam, fillAnswer, getExamConfig } from '@/api/paper/exam'
import { Loading } from 'element-ui'
import ExamTimer from '@/views/paper/exam/components/ExamTimer'
import ExamVideo from '@/views/paper/exam/components/video/examVideo';
import WebChange from '@/views/paper/exam/components/webChange'
export default{
  name: 'ExamProcess',
  components: { ExamTimer, ExamVideo, WebChange },
  data() {
    return {

      // 考试设置
      examConfig: {},
      // 全屏/不全屏
      isFullscreen: false,
      showPrevious: false,
      showNext: true,
      loading: false,
      handleText: '交卷',
      pageLoading: false,
      // 试卷ID
      paperId: '',
      // 当前答题卡
      cardItem: {},
      allItem: [],
      // 当前题目内容
      quData: {
        answerList: []
      },
      // 试卷信息
      paperData: {
        leftSeconds: 99999,
        radioList: [],
        multiList: [],
        judgeList: []
      },
      // 单选选定值
      radioValue: '',
      // 多选选定值
      multiValue: [],
      //主观选定值
      text: '',
      // 已答ID
      answeredIds: [],
      // 所属考试id
      examId: '',
    }
  },
  created() {

    const id = this.$route.params.id
    const examId = localStorage.getItem('exam_id')
    if ((typeof id !== 'undefined') && (typeof examId !== 'undefined')) {
      this.paperId = id
      this.examId = examId
      this.fetchData(id)
      this.examConfigByExamId(examId)
    }
  },
  methods: {

    examConfigByExamId(id) {
      getExamConfig({ id: id }).then(res => {
        if (res.data != null) {
          this.examConfig = res.data
          this.enableCopy()
        }
      })
    },

    // 答题卡样式
    cardItemClass(answered, quId) {
      if (quId === this.cardItem.quId) {
        return 'warning'
      }

      if (answered) {
        return 'success'
      }

      if (!answered) {
        return 'info'
      }
    },

    /**
     * 统计有多少题没答的
     * @returns {number}
     */
    countNotAnswered() {
      let notAnswered = 0

      this.paperData.radioList.forEach(function (item) {
        if (!item.answered) {
          notAnswered += 1
        }
      })

      this.paperData.multiList.forEach(function (item) {
        if (!item.answered) {
          notAnswered += 1
        }
      })

      this.paperData.judgeList.forEach(function (item) {
        if (!item.answered) {
          notAnswered += 1
        }
      })

      return notAnswered
    },

    /**
     * 下一题
     */
    handNext() {
      const index = this.cardItem.sort + 1
      this.handSave(this.allItem[index])
    },

    /**
     * 上一题
     */
    handPrevious() {
      const index = this.cardItem.sort - 1
      this.handSave(this.allItem[index])
    },

    doHandler() {
      this.handleText = '正在交卷，请等待...'
      this.loading = true

      const params = { paperId: this.paperId }
      handExam(params).then(() => {
        this.$message({
          message: '试卷提交成功！',
          type: 'success'
        })

        this.$router.push({ name: 'ExamOnline', params: { id: this.paperId } })
      })
    },

    // 弃考
    outOfExam() {

      this.$message({
        message: '考试时间已过',
        type: 'error'
      })
      this.$router.push({ name: 'ExamOnline', params: { id: this.paperId } })
    },

    // 交卷操作
    handHandExam() {
      const that = this

      // 交卷保存答案
      this.handSave(this.cardItem, function () {
        const notAnswered = that.countNotAnswered()

        let msg = '确认要交卷吗？'

        if (notAnswered > 0) {
          msg = '您还有' + notAnswered + '题未作答，确认要交卷吗?'
        }

        that.$confirm(msg, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          that.doHandler()
        }).catch(() => {
          that.$message({
            type: 'info',
            message: '交卷已取消，您可以继续作答！'
          })
        })
      })
    },

    // 保存答案
    handSave(item, callback) {
      if (item.id === this.allItem[0].id) {
        this.showPrevious = false
      } else {
        this.showPrevious = true
      }

      // 最后一个索引
      const last = this.allItem.length - 1

      if (item.id === this.allItem[last].id) {
        this.showNext = false
      } else {
        this.showNext = true
      }

      const answers = this.multiValue
      if (this.radioValue !== '') {
        answers.push(this.radioValue)
      }

      const params = { paperId: this.paperId, quId: this.cardItem.quId, answerIds: answers, answer: this.text }
      fillAnswer(params).then(() => {
        // 必须选择一个值
        if (answers.length > 0) {
          // 加入已答列表
          this.cardItem.answered = true
        }

        // 最后一个动作，交卷
        if (callback) {
          callback()
        }

        //清空当前已存在的text 
        this.text = ''

        // 查找详情
        this.fetchQuData(item)

      })
    },

    // 试卷详情
    fetchQuData(item) {
      // 打开
      const loading = Loading.service({
        text: '拼命加载中',
        background: 'rgba(0, 0, 0, 0.7)'
      })

      // 获得详情
      this.cardItem = item

      // 查找下个详情
      const params = { paperId: this.paperId, quId: item.quId }
      quDetail(params).then(response => {
        console.log(response)
        this.quData = response.data
        this.radioValue = ''
        this.multiValue = []
        this.text = ''

        // 填充该题目的答案
        this.quData.answerList.forEach((item) => {
          if ((this.quData.quType === 1 || this.quData.quType === 3) && item.checked) {
            this.radioValue = item.id
          }

          if (this.quData.quType === 2 && item.checked) {
            this.multiValue.push(item.id)
          }
          if (this.quData.quType >= 4)
            this.text = this.quData.answer
        })

        // 关闭详情
        loading.close()
      })
    },

    // 试卷详情
    fetchData(id) {
      const params = { id: id }
      paperDetail(params).then(response => {
        // 试卷内容
        this.paperData = response.data

        // 获得第一题内容
        if (this.paperData.radioList) {
          this.cardItem = this.paperData.radioList[0]
        } else if (this.paperData.multiList) {
          this.cardItem = this.paperData.multiList[0]
        } else if (this.paperData.judgeList) {
          this.cardItem = this.paperData.judgeList[0]
        } else if (this.paperData.saqList) {
          this.cardItem = this.paperData.saqList[0]
        }

        const that = this

        this.paperData.radioList.forEach(function (item) {
          that.allItem.push(item)
        })

        this.paperData.multiList.forEach(function (item) {
          that.allItem.push(item)
        })

        this.paperData.judgeList.forEach(function (item) {
          that.allItem.push(item)
        })
        this.paperData.saqList.forEach(function (item) {
          that.allItem.push(item)
        })


        console.log("exam " + this.paperData.examId)
        // 当前选定
        this.fetchQuData(this.cardItem)
      })
    },

    //禁用tab切换
    forbidTab(e) {
      e.preventDefault();
    },
    async replaceSpacing() {
      let pos = document.getElementById("text").selectionStart;
      let arr = this.text.split('');
      arr.splice(pos, 0, "\t");
      this.text = arr.join('');
      await this.$nextTick(() => {
        document.getElementById("text").setSelectionRange(pos + 1, pos + 1);
      })

    },
    async nextLine() {
      let pos = document.getElementById("text").selectionStart;
      let arr = this.text.split('');
      arr.splice(pos, 0, "\n");
      this.text = arr.join('');
      await this.$nextTick(() => {
        document.getElementById("text").setSelectionRange(pos + 1, pos + 1);
      })
    },
    // getHeight(refName) { // 
    //   let textArea = this.$refs[refName];
    //   if (textArea.scrollHeight < 400) {
    //     textArea.style.height = textArea.scrollHeight + "px";
    //   } else {
    //     textArea.style.height = 400 + "px";
    //   }
    // },

    //获取设置
    enableCopy() {
      if (this.examConfig.copyQu) {
        // 网页禁止复制
        this.$refs.exam.onselectstart = function () { return false; };
      }

      if (this.examConfig.stick) {
        this.$refs.exam.onpaste = function () { return false; };
      }
    },
    outPage(e) {

      if (e > 0) {
        this.$alert('本场考试限制切屏次数，离开本页面7秒即认为切屏，超过次数将自动提交试卷；你还可以切屏次数为: ' + e, '提示', {
          confirmButtonText: '确定',
          type: 'warning'
        })
      } else {
        this.$alert('切屏次数达到限制', '提示', {
          confirmButtonText: '确定',
          type: 'warning',
          callback: action => {
            this.doHandler();
          }
        })
      }
    }

  }
}
</script>

<style scoped>
.qu-content div {
  line-height: 30px;
  width: 100%;
}

.el-checkbox-group label,
.el-radio-group label {
  width: 100%;
}

.content-h {
  height: calc(100vh - 110px);
  overflow-y: auto;
}

.card-title {
  background: #eee;
  line-height: 35px;
  text-align: center;
  font-size: 14px;
}

.program>>>.el-input__inner {
  font-family: "DejaVuSansMono";
  font-size: medium;
}

.program_textarea>>>.el-textarea__inner {
  font-family: "DejaVuSansMono";
  font-size: medium;
}

.card-line {
  padding-left: 10px
}

.card-line span {
  cursor: pointer;
  margin: 2px;
}

::v-deep .el-radio,
.el-checkbox {
  padding: 9px 20px 9px 10px;
  border-radius: 4px;
  border: 1px solid #dcdfe6;
  margin-bottom: 10px;
  width: 100%;
}

.is-checked {
  border: #409eff 1px solid;
}

.el-radio img,
.el-checkbox img {
  max-width: 200px;
  max-height: 200px;
  border: #dcdfe6 1px dotted;
}

::v-deep .el-checkbox__inner {
  display: none;
}

::v-deep .el-radio__inner {
  display: none;
}

::v-deep .el-checkbox__label {
  line-height: 30px;
}

::v-deep .el-radio__label {
  line-height: 30px;
}
</style>

